[swift-evolution] Conditional casting and conditional binding: Wierd edge case or flawed design

[Anton Zhilin]

A quick fix:

guard let value = dict["Key"].map({ $0 as NSString }) {
    use(value)
}

Current behavior is quite logical: main purpose of as? is to perform casts,
which are not guaranteed to succeed. But I’d say that as? should also
support what you want.
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